/*
 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 */

package javax.swing.plaf.basic;

import sun.swing.DefaultLookup;
import sun.swing.UIAction;
import java.awt.*;
import java.awt.event.*;
import java.beans.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.plaf.ActionMapUIResource;
import javax.swing.plaf.ButtonUI;
import javax.swing.plaf.ComponentInputMapUIResource;

/**
 * Button Listener
 *
 * @author Jeff Dinkins
 * @author Arnaud Weber (keyboard UI support)
 */

public class BasicButtonListener implements MouseListener, MouseMotionListener, FocusListener, ChangeListener, PropertyChangeListener {
    private long lastPressedTimestamp = -1;
    private boolean shouldDiscardRelease = false;

    /**
     * Populates Buttons actions.
     */
    static void loadActionMap(LazyActionMap map) {
        map.put(new Actions(Actions.PRESS));
        map.put(new Actions(Actions.RELEASE));
    }

    public BasicButtonListener(AbstractButton b) {
    }

    public void propertyChange(PropertyChangeEvent e) {
        String prop = e.getPropertyName();
        if (prop == AbstractButton.MNEMONIC_CHANGED_PROPERTY) {
            updateMnemonicBinding((AbstractButton) e.getSource());
        } else if (prop == AbstractButton.CONTENT_AREA_FILLED_CHANGED_PROPERTY) {
            checkOpacity((AbstractButton) e.getSource());
        } else if (prop == AbstractButton.TEXT_CHANGED_PROPERTY || "font" == prop || "foreground" == prop) {
            AbstractButton b = (AbstractButton) e.getSource();
            BasicHTML.updateRenderer(b, b.getText());
        }
    }

    protected void checkOpacity(AbstractButton b) {
        b.setOpaque(b.isContentAreaFilled());
    }

    /**
     * Register default key actions: pressing space to "click" a
     * button and registring the keyboard mnemonic (if any).
     */
    public void installKeyboardActions(JComponent c) {
        AbstractButton b = (AbstractButton) c;
        // Update the mnemonic binding.
        updateMnemonicBinding(b);

        LazyActionMap.installLazyActionMap(c, BasicButtonListener.class, "Button.actionMap");

        InputMap km = getInputMap(JComponent.WHEN_FOCUSED, c);

        SwingUtilities.replaceUIInputMap(c, JComponent.WHEN_FOCUSED, km);
    }

    /**
     * Unregister's default key actions
     */
    public void uninstallKeyboardActions(JComponent c) {
        SwingUtilities.replaceUIInputMap(c, JComponent.WHEN_IN_FOCUSED_WINDOW, null);
        SwingUtilities.replaceUIInputMap(c, JComponent.WHEN_FOCUSED, null);
        SwingUtilities.replaceUIActionMap(c, null);
    }

    /**
     * Returns the InputMap for condition <code>condition</code>. Called as
     * part of <code>installKeyboardActions</code>.
     */
    InputMap getInputMap(int condition, JComponent c) {
        if (condition == JComponent.WHEN_FOCUSED) {
            BasicButtonUI ui = (BasicButtonUI) BasicLookAndFeel.getUIOfType(((AbstractButton) c).getUI(), BasicButtonUI.class);
            if (ui != null) {
                return (InputMap) DefaultLookup.get(c, ui, ui.getPropertyPrefix() + "focusInputMap");
            }
        }
        return null;
    }

    /**
     * Resets the binding for the mnemonic in the WHEN_IN_FOCUSED_WINDOW
     * UI InputMap.
     */
    void updateMnemonicBinding(AbstractButton b) {
        int m = b.getMnemonic();
        if (m != 0) {
            InputMap map = SwingUtilities.getUIInputMap(b, JComponent.WHEN_IN_FOCUSED_WINDOW);

            if (map == null) {
                map = new ComponentInputMapUIResource(b);
                SwingUtilities.replaceUIInputMap(b, JComponent.WHEN_IN_FOCUSED_WINDOW, map);
            }
            map.clear();
            map.put(KeyStroke.getKeyStroke(m, BasicLookAndFeel.getFocusAcceleratorKeyMask(), false), "pressed");
            map.put(KeyStroke.getKeyStroke(m, BasicLookAndFeel.getFocusAcceleratorKeyMask(), true), "released");
            map.put(KeyStroke.getKeyStroke(m, 0, true), "released");
        } else {
            InputMap map = SwingUtilities.getUIInputMap(b, JComponent.WHEN_IN_FOCUSED_WINDOW);
            if (map != null) {
                map.clear();
            }
        }
    }

    public void stateChanged(ChangeEvent e) {
        AbstractButton b = (AbstractButton) e.getSource();
        b.repaint();
    }

    public void focusGained(FocusEvent e) {
        AbstractButton b = (AbstractButton) e.getSource();
        if (b instanceof JButton && ((JButton) b).isDefaultCapable()) {
            JRootPane root = b.getRootPane();
            if (root != null) {
                BasicButtonUI ui = (BasicButtonUI) BasicLookAndFeel.getUIOfType(b.getUI(), BasicButtonUI.class);
                if (ui != null && DefaultLookup.getBoolean(b, ui, ui.getPropertyPrefix() + "defaultButtonFollowsFocus", true)) {
                    root.putClientProperty("temporaryDefaultButton", b);
                    root.setDefaultButton((JButton) b);
                    root.putClientProperty("temporaryDefaultButton", null);
                }
            }
        }
        b.repaint();
    }

    public void focusLost(FocusEvent e) {
        AbstractButton b = (AbstractButton) e.getSource();
        JRootPane root = b.getRootPane();
        if (root != null) {
            JButton initialDefault = (JButton) root.getClientProperty("initialDefaultButton");
            if (b != initialDefault) {
                BasicButtonUI ui = (BasicButtonUI) BasicLookAndFeel.getUIOfType(b.getUI(), BasicButtonUI.class);
                if (ui != null && DefaultLookup.getBoolean(b, ui, ui.getPropertyPrefix() + "defaultButtonFollowsFocus", true)) {
                    root.setDefaultButton(initialDefault);
                }
            }
        }

        ButtonModel model = b.getModel();
        model.setPressed(false);
        model.setArmed(false);
        b.repaint();
    }

    public void mouseMoved(MouseEvent e) {
    }

    public void mouseDragged(MouseEvent e) {
    }

    public void mouseClicked(MouseEvent e) {
    }

    public void mousePressed(MouseEvent e) {
        if (SwingUtilities.isLeftMouseButton(e)) {
            AbstractButton b = (AbstractButton) e.getSource();

            if (b.contains(e.getX(), e.getY())) {
                long multiClickThreshhold = b.getMultiClickThreshhold();
                long lastTime = lastPressedTimestamp;
                long currentTime = lastPressedTimestamp = e.getWhen();
                if (lastTime != -1 && currentTime - lastTime < multiClickThreshhold) {
                    shouldDiscardRelease = true;
                    return;
                }

                ButtonModel model = b.getModel();
                if (!model.isEnabled()) {
                    // Disabled buttons ignore all input...
                    return;
                }
                if (!model.isArmed()) {
                    // button not armed, should be
                    model.setArmed(true);
                }
                model.setPressed(true);
                if (!b.hasFocus() && b.isRequestFocusEnabled()) {
                    b.requestFocus();
                }
            }
        }
    }

    public void mouseReleased(MouseEvent e) {
        if (SwingUtilities.isLeftMouseButton(e)) {
            // Support for multiClickThreshhold
            if (shouldDiscardRelease) {
                shouldDiscardRelease = false;
                return;
            }
            AbstractButton b = (AbstractButton) e.getSource();
            ButtonModel model = b.getModel();
            model.setPressed(false);
            model.setArmed(false);
        }
    }

    public void mouseEntered(MouseEvent e) {
        AbstractButton b = (AbstractButton) e.getSource();
        ButtonModel model = b.getModel();
        if (b.isRolloverEnabled() && !SwingUtilities.isLeftMouseButton(e)) {
            model.setRollover(true);
        }
        if (model.isPressed())
            model.setArmed(true);
    }

    public void mouseExited(MouseEvent e) {
        AbstractButton b = (AbstractButton) e.getSource();
        ButtonModel model = b.getModel();
        if (b.isRolloverEnabled()) {
            model.setRollover(false);
        }
        model.setArmed(false);
    }

    /**
     * Actions for Buttons. Two types of action are supported:
     * pressed: Moves the button to a pressed state
     * released: Disarms the button.
     */
    private static class Actions extends UIAction {
        private static final String PRESS = "pressed";
        private static final String RELEASE = "released";

        Actions(String name) {
            super(name);
        }

        public void actionPerformed(ActionEvent e) {
            AbstractButton b = (AbstractButton) e.getSource();
            String key = getName();
            if (key == PRESS) {
                ButtonModel model = b.getModel();
                model.setArmed(true);
                model.setPressed(true);
                if (!b.hasFocus()) {
                    b.requestFocus();
                }
            } else if (key == RELEASE) {
                ButtonModel model = b.getModel();
                model.setPressed(false);
                model.setArmed(false);
            }
        }

        public boolean isEnabled(Object sender) {
            if (sender != null && (sender instanceof AbstractButton) && !((AbstractButton) sender).getModel().isEnabled()) {
                return false;
            } else {
                return true;
            }
        }
    }
}
